Spraying device



March 19, 1940. M, V EL 2,194,339

SPRAYING DEVICE Filgd Dec. 13,. 1938' INVENTOR Patented Mar. 19 I UN T-E(S AT PATENT OFFICE This invention. relates "to spraying devices of thecharacteremployed for the distribution of 'liquid insecticide, and suchas is shown in my I co-pending application, Serial No. 220,041, filedJuly 19, 1938,- 'an'd the objectxof the present invention is to improvethe spraying results; to

prevent clogging'of the air blast and spray openings, and to impartarotative or swirling action to the air streamland particles of liquidcarried thereby. p

In certain types of sprayers of the character mentioned, a retractivemovement of the piston tends'to draw liquid into the piston chamber.

While this is prevented in sprayers of relatively expensive or intricateconstruction through; the use of valves, thepresent inventioncontemplates the provisionfofa simple and less expensive means by whichthis undesirable characteristic may be prevented, The invention hastherefore,

as one of its objects, the provision of means by which the flow ofliquid into the air chamber on retractive movement of the piston iseliminated.

In theac'companying'drawing, wherein an embodiment of the invention isshown, Fig. If is a a sectional view through a spraying device of theimproved construction, the section being taken on the line I--I of Fig.2; looking in the direc-- tion' of the arrows; Fig. 2 is a frontelevation of the, same; Fig. 3 is an enlarged sectional view through thespray nozzle; Fig. 4 is a front elevation of the apertured cap at theend of the piston chamber;- Fig. 5 ma sectional View on-the' line 5 -5of Fig. 4, loiokingz'in :the direction of. the arrows; and Fig. 6 is a'front elevation of the cap with a modified formrof opening providedtherein. I

In the drawing I indicates the piston-chamber of the sprayer;the samebeing of the conventional cylindrical form, and generally composed of arolled-up section of sheet metalhaving its longitudinal edges seamedtogether. Mounted for reciprocation within'the cylinder I is a piston{ofconventional form, thesame being'fastened to oneend of a piston rod 3which extends out of the rear end of the piston'chamber or cylinder I;usually through an opening formed in a.

' pluglocated in that end." The projecting end of ,the rod' 3 terminatesin a handle, not shownlbut of conventional form, to enable, the pistonto .be

reciprocated in the manner wellknown sprayer construction.

.The forward end of the cylinder I is closed by a cap member Shaving itsmarginal edge seamed at'la to, the end of the cylinder I, said cap beingCal formed with a forwardly extending cylindrical cupportion 4 having afront end or wall 5. provided with three spaced arcuate depressions Ilocated around a central protuberance 8 through which a spray opening 9is formed.

Fitted within the cap member 6 and held therein by frictional fit or byany other suitable means is a cup-shaped member or inner cap It providedwith a forwardly extending nose I I of a diameter less than the internaldiameter of the cylindrical cup portion 6 so that an annular chamber I4is annular chamber I4 is a siphon tube I5 which extends upwardly'fromwithin the liquid supply in the conven- I tank 29 secured to thecylinder I tional manner. p The nose portion II of the cup-shaped memberI0 has its front wall I8 formed with an air blast formed within thecup-shaped member 6' be. tween the inner face thereof and the protrudingnose portion II of'member I0. Entering into the opening I3 preferablylocated in alignment with the sprayopening 9, the spray opening beingpreferably of larger opening I3; I I

diameter than the air blast It is desirable that the space 20- betweenthe front wall I8 of the nose II and the front Wall 5jof member 6 bedefinite and of unvarying size and of less width than the width of theannular chamber I whereby the amount of liquid ejected P out of thespray opening 9 will be regulated. The "fixed spacing of thesetwo wallson the members 6 and I I is governed by means of fixed stops provided bythe inner faces of the arcuate depressions I. Thus,'when the cup-shapedmember It! is pressed or otherwise secured in position within .member 6,as shown in Fig. 1, the front ofthe nose portion II coming into contactwith the inner faces of the depressions I wil-llimit the extent to whichthe member I!) may be'inserted within member 6 and at-thevsametime act170135.

The arcuate depressions l are spaced from one another by pressedout-ribs 2I (Fig. 3) which radiate from theprotuberance 8 and form attheir sages which connect theprotuberance 8'with the annular chamber I4.Liquid is drawn through these channels from chamber It to the spray"opening, the number and size'of these channels Pressed within the noseportion 23 and a circumferential wall 24, the latter fittingtightlywithin the nose portion I I, as

indicated in Fig. 1, and frictionally holding the "cup in. place andlocating the wall portion 23 at 'adistance from the front Wall I8.oftheinose. The' cup 22; which is shown in detail in Figs. 4 "and 5, isformed with several apertures 25' which are produced by slitting thewall 23 and distort ing portions of the wall adjacent the slits to'pro+"positivelyspace the wall It of'member II a defiv nite distance awayfromthe front wall 5 of membar 6.

.inner' or concave sides radial channels or pas- I serving also toregulate the supply of liquid to 'the spray opening. I i I Q portion 1 iof the meml ber II) is a'cup 22 having an apertured plate vide atapering passage or hood 26 near each slit.

In operation, movement of the piston in a direction toward the wall 22will cause the air displaced by the piston to be forced through thepassage 25 and out through the openings 25 with a swirling motion, theair so directed passing through the air blast opening it, drawing liquidthrough passages 2i and ejecting it in a swirling fine mist out throughthe spray opening 9. Upon retractive movement of the plunger it has beenfound that while a small amount of liquid might, possibly be drawnthrough the air blast opening it into the space within the nose i 5-between the wall it and plate 23, the liquid will not be drawn throughthe apertures 25 and into the piston chamber, and any liquidHin-saidspace will be blown out on the following forwardmovement oi the piston.

"While the particular formation of apertures 25 and accompanying taperedpassages 25 has been found especially effective in imparting-a swirlingmovement of air forced throughthem' and also effective in preventingliquid from being drawn into-the piston chamber, other forms'jofapertures in the plate 22 might be equallyas efiective. For example,inFig. dthe cup 22 is shown as having its plate portion 23 formed with aplurality of small holes Bil which break up the air stream, causing aswirling motion of the same within the, nose portion H and alsopreventing liquid to be drawn into theinside of the piston chamber.Various other modifications may also be made without departingfrom thespirit of the invention.

What I claim is: v A LA sprayer having an air cylinder, a piston mountedfor reciprocating movement therein, a closure cap disposed over oneendoi said-cylinder, said closure cap having a forwardly extending noseportion, said noseportion having a centra'lly located spray opening,aqcup member fittedof the cup being formed with angularly disposedpassages leading to openings formed through said closed end.

2. A sprayer having an air cylinder provided with a closure cap at oneend, an inner cupmember fitted within the closure cap, the innercup-member having a projecting portion extending within the closure capnearto therea'r face of the front end of said cap, the shapes of saidprojecting portion and closure cap being such as to form an annularchamber between them, spaced projections formed on thefront end of theclosure cap and projecting inwardly therefrom and in' abutment with thefront end of the projecting portion of the cup-member, aligned openingsthrough the closure cap and cup-member, said openings constitutingaspray opening and air blast opening respectively, and

radial passages formed in the front end .ofithe closure cap between theprojections thereon, said closure cap and cup-member.

3. A sprayer having an air cylinder, 'a piston I 'passages connectingthe annular mounted for reciprocating movement therein, a

closure cap disposed on one end of said air cyl inder, a cup-memberfitted within the closure cap, said cup member having a, forwardlyextended reduced portion provided with a front end extending close-t0the front. end of the'closure cap, the shape of said forwardlyextendedportion of the cup-member being such as to form 5 v,

an annular'chamber between it and the'c-losure .cap, a liquid-supplytank supported by the cyli'nder, a siphon tube-extending from within thetank andcommunicating with the annular chamber,the front end of the cupmember being provided with an air-blast opening, the front endv oftheclosure cap having aspray opening, and

the front end of the closure cap having radial the spray opening. H i Ychamber with, a

extending within the closure cap and so shaped as to form an annularliquid-siphon chamber I between itself andthe closure cap, acommunication between said chamber and a source of; liquid supply, saidnose portion being provided with an end wall located adjacent to thefront: end wall of the closure cap, "the .nose portion of the inner capbelngprovided'with an air blast. opening located in proximityto'thespray opening,. and a cup-shaped member located-Within the nose portionand provided with'a plurality of openings extending through it.

A sprayer having an airgcylinder, a pis'ton; mounted for reciprocating-.movement therein, a.

closure cap extending over one" endof the cylinder, a cupmember nestedwithin the; closure cap tween it and the closure cap, a communicationbetween said chamber and a source of liquid supply, closure cap having aspray opening, the

cup member having'an air blast opening, and-a separating member of cupform fitted within-the *cup member and ,disposed between the piston andthe air blast opening, 'said separating memher being provided with aplurality of) hooded 50 openings thehood's extending over said openingsbeing angularly disposed with "respect to one another. v I

6, A sprayer. having'an air cylinder, a pistonmounted for reciprocatingmovement therein,l a

"closure cap extending over one end of said cylinder, said closure caphaving a forwardly extending nose portion provided'witha centrallylocated shaped so as to form an annular chairiberbetween 1tself' andsaid nose portion, a communie ,"cation between said chamber and a sourceof liquid supply, said cup memberhaving an air blast opening extendingthroughiit inproXimity to the spray opening, a cup nested within thecuomember and -co-operating therewith the formation of achamber withinthe cup member, said cup having a wall interposed between the,

piston and the air-blast opening, said wall hav ing a'plurality ofopenings-all of which are dis" aligned with the air blast opening.

Wmm-At/IMARTIN meet." t

as L

i0 and shaped to form an annular chamber be-

